Supervisor David Chiu and his supporters handed out Yes on E posters to businesses on Polk Street. San Francisco Board of Supervisors President David Chiu and a handful of supporters canvassed the middle Polk Street area encouraging voters to support Prop. E on election day Tuesday November 6, 2012.

San Francisco voters overwhelmingly rejected Proposition F, a plan that would have taken the first steps toward draining Hetch Hetchy Reservoir and drastically revamped the way much of the Bay Area gets its water.

The city also approved Proposition E, which will revise the city's business tax, and Proposition B, a $195 million park bond that needed a two-thirds vote to pass.

Proposition C, which will provide money for affordable housing, was also approved , while Proposition D, which will consolidate the elections for city attorney and city treasurer with the mayor's race, won easily.

Proposition G, a policy statement declaring San Francisco's opposition to increased corporate financing in politics, passed by a wide margin.

The Prop. F initiative was the culmination of a years-long effort by environmentalists to restore Hetch Hetchy Valley in Yosemite National Park. The valley was flooded in 1923, when the city dammed the Tuolumne River to create a water system that now serves 2.6 million people in San Francisco and 29 other Bay Area cities.The measure, supporters said, would have compelled the city to take a much-needed look at its water usage and come up with a plan to replace the water and power now supplied by the Hetch Hetchy Reservoir. A separate vote in 2016 would have been required before the O'Shaughnessy Dam could be demolished.

But opponents successfully argued that not only is the reservoir impossible to replace, but restoring the valley would cost billions in public money that's just not there.

Prop. E will change how San Francisco levies its business tax, which is the city's second-largest source of general fund revenue behind property taxes, bringing in $410 million last year.

The measure, the result of a compromise Mayor Ed Lee worked out with business and labor in the city, will replace the city's current business tax, based on a company's total payroll, with one based on revenue. The rates would vary by industry and company size.

It's also expected to generate an additional $28.5 million a year for city coffers from increased business license fees, which haven't been raised since 2001.

Part of the additional money from increased license fees - about $13 million in the first year - will help offset the cost of the Prop. C housing measure.

When fully implemented, the 30-year program would funnel almost $51 million a year into affordable and middle-income housing. It would also reduce by 20 percent developers' requirements for building on-site affordable units, and it would cap affordable-housing requirements for the next 30 years at the current level unless a developer is seeking an exemption to a city land-use rule.

The park bond will earmark $133.5 million to repair and upgrade 21 neighborhood parks and playgrounds across the city, with the remaining $61.5 million going for citywide park projects.

As with many San Francisco ballots, Tuesday's featured an advisory measure allowing local residents to weigh in on matters of national significance. This time, it was Prop. G.

It calls on Congress to pass a constitutional amendment reversing the U.S. Supreme Court ruling in 2010 that permitted unlimited spending on political campaigns by corporations on the basis that, like people, they have free speech rights.

Prop. D will eliminate the separate low-turnout elections for city attorney and city treasurer. In order to get the offices on the new cycle, the scheduled November 2013 election for the posts will be for two-year terms, with an election for full, four-year terms in 2015.